﻿using System;
using System.Collections.Generic;
using System.Linq;
using System.Text;
using System.Threading.Tasks;

namespace Bai1
{
    public class HinhVuong
    {
        public int DoDai { get; set; }

        public int ChuVi()
        {
            return DoDai * 4;
        }
    }
}
